Ball valve



FIG. 1 is a perspective view of a ball valve in accordance with the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a bottom perspective view thereof.

The broken line shown in the figures are included for the purpose of illustrating portions of the ball valve and form no part of the claimed design. 

CLAIM The ornamental design for a ball valve, as shown and described. 